Yes, you do have an idea, but nope I won´t post the chip manufacturer system requirements as you´d expect here, because it is what you want me to do, just to say that besides 2x HD 7770, the OP CPU, memory, HDD, etc, all together do not need 469W (600 - 131).
I wonder why you didn´t post the correct wattage for the OP´s system -- instead you posted a huge and unnecessary card, with a lot of irrelevant stuff -- why on the hell the OP needs to know, for instance, that a GTX 590 uses 350W? Or that an HD 6990 needs 288W, and so on and forth?
The only thing the OP needs to know is how much wattage it is needed to power 2x HD 7770, and the rest of the system, but you haven´t delivered the information, but shown expertise in tumulting!